Hot Forged CuNi 70/30 S/O Flange Class150 Long Service Life 20 Years

Product Specification

Hot Forged CuNi 70/30 S/O Flange Class150 Long Service Life 20 Years

1. Product Description

Copper Nickel Flange is manufactured from premium CuNi 70/30 (UNS C71500) raw material through forging process, featuring socket weld connection type. The product is manufactured in strict accordance with ASME B16.5 standard, with pressure rating of Class 150 (150LB). Due to its excellent seawater corrosion resistance and anti-biofouling properties, copper nickel alloy flanges are widely used in shipbuilding, seawater desalination, offshore oil platforms, chemical heat exchangers and other marine and industrial applications. This product features Raised Face sealing surface to ensure reliable sealing performance in pipeline connections.

2. Key Product Parameters

3. Product Applications

• Marine seawater cooling pipeline systems

• Offshore oil & gas platform firefighting and ballast water systems

• Seawater desalination plant (MED/MSF process) piping connections

• Coastal power plant condensers and heat exchangers

• Chemical industry corrosive media transport pipelines

• Offshore engineering subsea pipeline systems

• Ship freshwater generator piping systems

• Aquaculture seawater circulation systems

4. Product Advantages

1. Excellent Seawater Corrosion Resistance: CuNi 70/30 alloy exhibits extremely low corrosion rates in both flowing and stagnant seawater, with a service life exceeding 20 years.

2. Superior Anti-Biofouling Performance: Copper element naturally inhibits marine microorganism adhesion, reducing pipeline blockage risks and maintenance frequency.

3. High Erosion-Corrosion Resistance: Material maintains good corrosion resistance under high-velocity seawater scouring, with maximum allowable flow velocity up to 3.5-4.0 m/s.

4. Forging Process Assurance: Hot forging process ensures uniform and dense grain structure, significantly better mechanical properties than cast products.

5. Good Weldability: Compatible with carbon steel and stainless steel pipeline welding, enabling convenient on-site installation with reliable weld joint strength.

6. Low Maintenance Cost: Self-healing passive film forms on material surface, eliminating the need for additional coatings or cathodic protection, with low lifecycle costs.

7. High Dimensional Accuracy: ASME B16.5 standard strictly controls tolerances to ensure perfect fit with standard pipe fittings.

5. Product Functions

• Realize socket weld connection between pipes in seawater piping systems

• Provide reliable sealing interface to prevent seawater medium leakage

• Withstand Class 150 working pressure to ensure safe operation of piping systems

• Adapt to long-term stable operation in marine humid and salt spray environment

• Enable sectional connection and maintenance disassembly of piping systems

6. User Instructions

Pre-Installation Preparation:

1. Inspect flange appearance, confirm no cracks, deformation, rust or other defects.

2. Verify flange size, pressure rating, and material identification against design drawings.

3. Clean flange weld end and sealing surface, removing oil, oxide scale and other impurities.

Installation Steps:

1. Insert pipe into flange socket, ensuring proper insertion depth (per ASME B16.5 socket depth requirements).

2. Leave 1.6mm expansion gap (distance between pipe end and socket bottom) to avoid welding stress concentration.

3. Use TIG or MIG welding process with compatible CuNi filler metal (e.g., ERCuNi welding wire).

4. Control interpass temperature not exceeding 150°C during welding to avoid alloy element burn-off from overheating.

5. Use PTFE or graphite-reinforced gasket for sealing surface, tighten bolts evenly in diagonal sequence.

Post-Installation Inspection:

1. Conduct penetrant or radiographic testing on welds to ensure no welding defects.

2. System hydrostatic test pressure shall be 1.5 times design pressure, hold for 30 minutes without leakage.

7. Product Precautions

1. Avoid Direct Contact with Carbon Steel: Copper-nickel alloy in contact with carbon steel may cause galvanic corrosion, must be stored and transported separately.

2. Avoid Ammonia-Containing Media: Copper alloys are prone to stress corrosion cracking in ammonia environments, strictly prohibited for ammonia systems.

3. Welding Shielding Gas Requirement: Argon gas protection must be used during welding to prevent weld oxidation and porosity.

4. Avoid Excessive Seawater Flow Velocity: Although CuNi 70/30 has excellent erosion-corrosion resistance, continuous flow velocity is recommended not to exceed 3.5m/s.

5. Avoid Dissimilar Metal Mixing: Piping systems should maintain material uniformity to avoid galvanic corrosion risks. If dissimilar metal connection is required, insulating joints must be installed.

6. No Post-Weld Heat Treatment Required: CuNi alloy generally does not require post-weld heat treatment, but welding spatter and oxides must be removed.

7. Storage Environment Requirements: Store in dry and ventilated indoor area, avoid outdoor exposure and rain, ambient humidity ≤ 60%.

8. Shipping Information

• Shipping Origin: Direct shipment from China factory

• Delivery Time: Standard sizes available in stock, 3-5 working days; custom sizes 15-30 days (subject to quantity and specifications)

• Shipping Methods:

  • Small orders/Samples: International Express (DHL/FedEx/UPS/TNT), 3-7 days arrival

  • Bulk orders: Sea freight FCL/LCL, 15-45 days arrival

  • Urgent orders: Air freight, 5-10 days arrival

• Documents Provided:

  • Commercial Invoice

  • Packing List

  • Certificate of Origin

  • Material Test Certificate (MTC per EN 10204 3.1)

  • Bill of Lading

• Trade Terms: FOB, CIF, CFR, EXW available

• Logistics Tracking: Tracking number provided after shipment, full traceability

9. Payment Information

• Standard Payment Methods:

  • T/T Wire Transfer: 30% advance payment, 70% balance before shipment

  • L/C at Sight: Irrevocable Letter of Credit at sight accepted

  • Western Union (applicable for small amounts)

• Credit Customers:

  • Long-term customers may apply for O/A credit terms (subject to credit review)

  • Monthly settlement terms available for customers with 1+ year cooperation history

• Settlement Currency: USD, EUR, CNY accepted

• Bank Information: Official bank account details provided upon contract signing

• Payment Notes:

  • Order becomes effective upon receipt of advance payment

  • Installment payment plans negotiable for large orders

  • All payments must reference invoice number or contract number

10. Packaging Information

• Standard Packaging Options:

  • Small flanges (≤4"): Individual bubble wrap + carton packaging

  • Medium flanges (6"-12"): Individual bubble/EPE foam wrap + wooden case or plywood case

  • Large flanges (≥14"): Stretch film + palletized fumigated wooden crate

• Moisture & Corrosion Prevention:

  • Anti-rust grease applied on sealing surface

  • Desiccant placed inside packaging

  • Vacuum aluminum foil packaging when necessary

• Marking & Labeling:

  • Specification, material, quantity, weight marked on outer packaging

  • Fragile/Moisture-proof/This Side Up labels applied

• Custom Packaging: Special packaging available upon customer request (e.g., designated shipping marks, split packaging)

• Packaging Cost: Standard packaging included in quotation; custom packaging charged separately

11. Purchase, Return & After-Sales Service

Purchase Process:

1. Customer provides specifications, quantity, material requirements to obtain quotation

2. Both parties confirm technical parameters, delivery time, payment terms, and sign sales contract

3. Customer makes advance payment, factory begins production

4. Production completed, arrange third-party or customer inspection (optional)

5. Balance payment made, arrange shipment

6. Full set of export documents provided after shipment

Return & Exchange Policy:

• Quality Issues: If product has material non-conformance or manufacturing defects, customer must notify in writing within 30 days of receipt. Upon mutual confirmation, supplier shall provide free replacement or refund and bear round-trip freight costs.

• Non-Quality Issues: For returns due to customer order errors, customer bears round-trip freight, product must remain in original intact packaging, return/exchange request deadline is 15 days from receipt.

• Non-Returnable Situations: Products that have been welded/installed, non-standard custom sizes (non-stock specifications), damage caused by improper storage or usage.

After-Sales Service:

• Warranty Period: 12 months from date of shipment

• Technical Consultation: 24/7 online technical support available (email/instant messaging)

• On-Site Service: Engineer on-site installation guidance available for major projects (fees negotiable)

• Documentation Support: EN 10204 3.1/3.2 material certificates, NDT reports, etc. available

• Complaint Response: Response within 24 hours of receiving complaint, solution proposal within 72 hours

• 1. Are you trading company or manufacturer ?
  We are manufacturer ,You can see the certification.
  2. How long is your delivery time?
  Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
  3. Do you provide samples ? is it free or extra ?
  Yes, we could offer the sample for free charge but need pay the cost of freight.
  4. What is your terms of payment ?
  Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.